Sealing-nipple for vacuum-jackets.



J. L. FATE.

SEALING NIPPLE FOR VACUUM JACKETS.

APPLIOATION FILED JULY 25, 1907.

926,694. Patented June29, 1909.

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UNITED STATES PATENT OFFICE.

JOHN L. FATE, OF CHICAGO, ILLINOIS, ASSIGNOR TO AMERICAN INSULATING COMPANY, A

CORPORATION OF MAINE.

SEALING-NIPPLE FOR VACUUM-JACKETS.

No. 926,694. Specification of Letters Patent. Patented June 29, 1909;- Applicat'ion filed July 25, 1907. Serial No. 385,547.

To all whom it may concern: fusible metal 5, through which the air can 55 Be it known that I, EIOHN L. FATE, a citibe drawn by the exhausting pump.

zen of the United States, residing at Chicago, The numeral 6 represents a section of flexiin the county of Cook and State of Illinois, He hose or pipe leading to an exhausting v have invented a certain new and useful Impump not shown. The exhausting ump is provement in Sealing-Nipples for Vacuumassumed to have a valve or stop coc inter- 0 Jackets, of which the following is a specific'amediate its barrel and the hose or ipe section. tion 6, which valve can be closed wit out the A number of sealing nipples have been inremoval of the pump. for maintaining a vented for this purpose. The ones with vacuum on both sides of the fusible mawhich I am familiar are subject to the objecterial 5. tion that there is always more or less of a oss Under the action of the pump the air is exof the vacuum during the operation of clos hausted from the chamber 2 and the niyple ing the seal. 3, as the pellets of fusible material rea lly 15 My invention has for its object to provide permit the air to pass therethrough. After .an e. ective means for sealing vacuum jackthe vacuum has been made as nearly perfect ets; and to this end the same consists of the as can be done under the action of the pump, novel devices and combinations of devices the stop cook or valve at the pump is turned hereinafter described and defined in the into its closed position, so as to prevent the 0 claims. back flow of any air from the atmosphere In the broad point of view, my invention through the hose 6 and the nipple 3 to the is Within the principles disclosed in my earlier vacuum chamber 2. Then heat is applied to filed pending case S. N. 318,639, filed May 25, that portion of the nipple 3 containing the 1906 and is covered by the generic claims pellets of fusible material 5, while the vac- 5 therein contained. It is, however, a mateuum is maintained on both sides thereof, and

rial improvement over the form of structure the fused material will run down, into the disclosed in my said earlier case. trap portion 3 of the nipple and there solid- The invention is illustrated in the accomify, as shown by the dotted lines in the drawpanying drawing wherein the single view is ing; and as soon as this occurs the vacuum 0 a vertical sectional elevation through a vacuchamber will be hermetically sealed. Then um jacket equ'lpped with my improved form the protruding art of the nipple is cut off of seahng nipp e. close to the wall of the jacket and may, if

In the said drawing, the numeral 1 repredesired, be covered by ashield. The vacuum sents a hollow body adapted, when the air is jacket is then ready for use.

' exhausted therefrom, to afford a vacuum In the drawing the full lines show the chamber 2. fusible material 5 as located when in the The numeral 3 represents my improved form of pellets or small particles, through sealing nipple. This nipple is seated in one which the air can be drawn under action of wall of the jacket 1 and, as shown, has a the ump, and the dotted lines show this flange 4 which is brazed to the wall of the fusib e material 5 as it becomes solidified in jacket for rigidly connecting the nipple the trap portion 3 of the nipple after it has thereto with an air tight joint. The nipple been fused under the application of heat to is of such size and shape that it has a portion the projecting portion of the nip le containlocated within the chamber 2 of the jacket 1 ing the fusiblematerial in pellet form. The V and an external portion rojecting outward heat for this purpose can conveniently be above the wall in whicht eni ple is seated; applied by an ordinary blow pipe. The

and that portion of the nipp e within the fusible material 5 may be ordinaly solder or chamber 2, as shown, is sha ed to afford a any other metal having a lower fusibility sealing trap 3 and the nipp e is contracted than the metallic nip 1e 3.

at the junction of this trap portion thereof It, perhaps, shouh e noted that when the with the external or projecting part of the nipple is made of the form and applied as nip le. This contraction is sufficient to illustrated and described, there is no proen. la the external projecting ortion of the jecting portion left outside the external surnipple to hold particles of so der or other face of the jacket wall after the scaling is cause it avoids the danger of cracking the com leted and the projecting end of the! nipp e is cut off. This is an advantage besolder or breaking the joint at the place where the nipple is seated in the wall of the jacket.

The method of sealing herein disclosed is not claimed herein, but is made the subject matter of another application.

What I claim is as follows:

1. The combination with a hollow body adapted to afford a vacuum jacket when the air is exhausted therefrom, of an air exhausting and sealing nipple seated in one wall of said jacket adapted to be loaded with fusible material through which the air can be pumped and which nipple is shaped to afford a sealing trap into which said fusible material will flow and solidify after being fused within the nipple while the vacuum is maint ined on both sides thereof, thereby hermetically sealing the vacuum acket,

substantially as described. I

2. The combination with a hollow body adapted to afford a vacuum jacket when the air is exhausted therefrom, of an air exhausting sealing nip ie seated in one wall of said jacket adapter to be loaded with fusible material through which the air can be pumped, and Which nipple is shaped to alford a sealing trap into which said material Will flow When fused and operate to seal the vacuum jacket and which nipple has its trap portion located within the vacuum chamber, substantially as described.

JOHN L. FA'IE.

/Vitnesses:

A; NELSON, H. L. DODSON. 

